[Boost-users] Confused about shared_mutex usage.

Hi all, I'm looking at the shared_mutex documentation here: http://www.boost.org/doc/libs/1_35_0/doc/html/thread/synchronization.html#th... But the documentation seems to be a little bit sparse and I'm having trouble figuring out how to use shared_mutex as a read/write lock. Just to make sure, lock_shared/unlock_shared is for the "readers", and lock/unlock is for the "writers"? If not, how do I lock/unlock it for reading, and how do I lock/unlock it for writing (exclusive lock)? Also I'm having trouble understanding what a "lock" is as opposed to a mutex. What is boost::shared_lock? Thanks! Jason